Add in the 1st version of ECP.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2832 6f19259b-4bc3-4df7-8a09-765794883524

EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/DivU64x32.c

@@ -0,0 +1,75 @@
+/*++
+
+Copyright (c) 2006, Intel Corporation                                                         
+All rights reserved. This program and the accompanying materials                          
+are licensed and made available under the terms and conditions of the BSD License         
+which accompanies this distribution.  The full text of the license may be found at        
+http://opensource.org/licenses/bsd-license.php                                            
+                                                                                          
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
+
+Module Name:
+
+  DivU64x32.c
+
+Abstract:
+
+  64-bit division function for IA-32
+
+--*/
+
+#include "Tiano.h"
+
+UINT64
+DivU64x32 (
+  IN UINT64   Dividend,
+  IN UINTN    Divisor,
+  OUT UINTN   *Remainder OPTIONAL
+  )
+/*++
+
+Routine Description:
+
+  This routine allows a 64 bit value to be divided with a 32 bit value returns 
+  64bit result and the Remainder.
+
+Arguments:
+
+  Dividend  - dividend
+  Divisor   - divisor
+  Remainder - buffer for remainder
+  
+Returns:
+
+  Dividend  / Divisor
+  Remainder = Dividend mod Divisor
+  
+N.B. only works for 31bit divisors!!
+
+--*/
+{
+  __asm {
+    xor edx, edx                    ; Clear EDX
+
+    mov eax, dword ptr Dividend[4]  ; Put high 32 bits of 64-bit dividend in EAX
+    mov ecx, Divisor                ; Put 32 bits divisor in ECX
+    div ecx                         ; Dividend   Divisor  Quoitent...Remainder
+                                    ;  0:EAX  /  ECX   =  EAX      EDX   
+
+    push eax                        ; Push quoitent in stack
+
+    mov eax, dword ptr Dividend[0]  ; Put low 32 bits of 64-bit dividend in EAX              
+    div ecx                         ; Leave the REMAINDER in EDX as High 32-bit of new dividend
+                                    ; Dividend   Divisor  Quoitent...Remainder              
+                                    ;  EDX:EAX  /  ECX   =  EAX      EDX               
+
+    mov ecx, Remainder              ; Put &REMAINDER to ecx
+
+    jecxz Label1                    ; If ecx == 0, no remainder exist, return with quoitent in EDX directly 
+    mov dword ptr [ecx], edx        ; Put EDX through REMAINDER pointer in ECX 
+
+Label1:
+    pop edx                         ; Pop High 32-bit QUOITENT to EDX
+  }
+}